Murdock appeared on The A-Team from the series beginning in 1983 until its cancellation in 1987. South African actor Sharlto Copley played the character in the 2010 film, while Schultz appeared in a small cameo as his neurologist.

Considered the best chopper pilot of the Vietnam War, Murdock is officially declared insane (possibly caused by post-traumatic stress disorder) when the other three are imprisoned for robbing the Bank of Hanoi. Although he was alleged to be the A-Team's pilot during the robbery, he is instead committed to a psychiatric hospital. It is never made clear if Murdock truly is insane or only exceptionally good at pretending he is (or a combination of the two). He is stated as having paranoid anxiety, delusions, and intermittent memory loss. It is suggested one has to be insane just to do the stunts he does in his helicopter.

Murdock is committed to a Veterans Administration (VA)Psychiatric Hospital, although he routinely escapes (generally with the help of Face) to accompany the A-Team on their missions. The symptoms of his "insanity" vary from episode to episode, but include self-identification with fictional characters, hallucinations, and belief in the "intelligence" of inanimate objects, among others. Murdock often appears childlike and is shown playing video games in his room and watching cartoons like Woody Woodpecker or Looney Tunes. He often "channels" a certain character for the duration of a mission (much to the chagrin of B.A.) or becomes fixated on a particular subject to the point of obsession. He also frequently refers to his invisible dog, "Billy".[4][5] B.A., uneasy with Murdock's unusual behavior, is easily annoyed by Murdock and regularly refers to him as a "crazy fool".

Murdock is almost always seen in a ball cap, a customized A-2 leather flight jacket with a picture of a tiger and the words "Da Nang 1970" on the back, a pair of khaki pants, and a pair of black Converse sneakers. He also often wears a t-shirt with a comical caption or a picture of cartoon characters like The Jetsons on it. Schultz said in a later interview that he was the one who devised the captions on the shirts, saying it was his "one constant contribution to the show." Although Murdock was a helicopter pilot in Vietnam, he is easily capable of flying any type of aircraft, including passenger planes, fighter jets, and even autogyros. It is mentioned in the pilot episode that Murdock flew with the elite United States Air Force Thunderbirds (by the mental institution's doctor to Col. Lynch just before he questions Murdock about the A-Team). In the episode "Bounty" (Season 3), it is revealed that Murdock served two tours in Vietnam, has three unit citations and a Silver Star, and was wounded twice. Interestingly, unlike B.A., the initials H.M. were never explained in terms of what Murdock's actual first and middle name were, and the nickname "Howlin' Mad" were simply attributed to them (although it is rumored that his name comes from World War II Marine CorpsGeneral Holland M. Smith, aka "Howlin' Mad", a nickname given by his troops). Not even his driver's license reveals what "H.M" stands for.[6]

It was revealed in the first season that Murdock and B.A. share the same blood type—AB negative, the rarest type. In the episode "Black Day at Bad Rock", B.A. receives a transfusion from Murdock, who was sprung from the hospital for just that reason, despite B.A.'s protests (fearing that Murdock's blood will make him "crazy"). This was again referenced in the second-season finale "Curtain Call" when Murdock is shot and B.A. wants to donate his own blood to save him. This episode also has several touching moments between the two, as B.A. spends most of the episode caring for and comforting Murdock and showing that, for all their bickering and disagreements, he and Murdock are actually very good friends.

Due to his nature, many of the details of Murdock's life are unknown, or possibly embellished. According to Amy in the pilot episode, Murdock's mother died when he was five (although they "still keep in touch"). If he is to be believed, he was raised (or at least influenced) by his grandmother (who is supposedly named "H. Emma Murdock") and his grandfather. In one episode in the third season, B.A. says that Murdock went insane after his plane crashed. The exact state of his insanity is never made clear, though he occasionally implies that it is his ticket to his "room and board". Despite his purported mental status, Murdock is a thoroughly competent member of the team when needed to be. Indeed, because he is not actually wanted by the military, Murdock is often the only team member to evade capture by a given episode's antagonists (or the military police), and he has single-handedly rescued the other team members several times. On the other hand, his visibility and location as a mental patient make Murdock an easy target, and he is abducted twice from the hospital. The first time, in the episode "Bounty", Murdock was taken by bounty hunters who wanted to capture the rest of the team. In the episode "Wheel of Fortune" Murdock was drugged and kidnapped by thieves who wanted to use his expertise as a pilot to heist an armored car using a Russian helicopter.

Murdock has extensive knowledge of various subjects and keeps up on current events, showing a genius-level aptitude. He speaks several languages including Spanish, German, Vietnamese, Japanese, Russian (not too well though) and Mandarin Chinese. In the second-season episode "The Maltese Cow", Murdock says, "What can I say? One day I had a gonzo headache and before it went away I could read and speak Chinese. And it was a bad afternoon, too, let me tell you." Murdock seems to possess a photographic memory and is also a talented actor and often accompanies Face on his scams. He is capable of impersonating the voices of famous individuals and mimicking many different foreign accents. It is also revealed in the Season 4 episode "Wheel of Fortune", that Murdock has worked for the Central Intelligence Agency (CIA) on at least two occasions, once in 1969 and once in 1972. Details of Murdock's missions with the CIA are not revealed.

Murdock, as a Captain, has the second highest military rank in the team. In the team, nevertheless, Face appears to be the second-in-command (probably due to Face being a Green beret, while Murdock is a helicopter pilot), but in the 4th episode of the second season ("Bad Time on the Border") where Hannibal Smith is taken prisoner, it is Murdock who plans Hannibal's rescue and the rest of the team follow him as leader. In the episode "The Road to Hope", the rest of the team is captured by a cell of domestic terrorists and Murdock organizes a group of homeless veterans to rescue them.

One particular insight into Murdock's unique world view comes during the season five episode "Trial By Fire". Murdock is asked to take the stand at the A-Team's murder trial and give testimony about his helicopter flight following the Hanoi bank robbery. The testimony takes the form of a surreal flashback from Murdock's perspective in which Murdock himself (wearing a grey wig and Biggles-style flight jacket) and his female co-pilot come under attack from The Spanish Armada, a sea serpent, and a tribe of Native Americans mounted on horseback, while Murdock spouts melodramatic dialogue. His mental acumen, however had generally improved by the fifth season to the point that he agonized whether to tell Face that the team's current client, A.J. Bancroft, was in fact Face's real father, and that Bancroft's daughter, Ellen, was his half-sister.

Murdock was permanently discharged from the mental institution in the fifth season, supposedly having regained his sanity, which is consistent with the fact he possibly only pretended to be insane as a cover. Following this event, instead of a different mental fixation every episode, Murdock took a different menial job each week, including stints working as a dog walker and a waiter.

Doctor Kelly Stevens (as played by Wendy Fulton, Dwight's actual wife) ("Bounty", season 3 episode 22) - A veterinarian that Murdock falls in love with while on the run from a group of bounty hunters who mean to use him as bait against the A-Team. Over the course of the episode they flirt, and Murdock shows his interest numerous times, an interest that she returns. She is not seen again, but she is notable for the fact that she is the only woman to visit Murdock at the V.A. hospital.

Jody Klineman, aka Jody Joy, played by Lydia Cornell. ("Wheel of Fortune", season 4 episode 13) picks up Murdock hitchhiking after he escapes from a group of men intent on robbing a Las Vegas casino. She recognizes him from the Wheel of Fortune and becomes excited that she has met someone "famous". She helps Murdock hide and run from the robbers only to be caught and held hostage along with Murdock. She flirts with him throughout the episode, finally kissing him after B.A. and Face arrive to rescue them. Murdock takes her on the trip to Hawaii that he won on Wheel of Fortune.

Erica. (Mentioned in "Family Reunion", season 5 episode 8. Seen in "The Grey Team", season 5 episode 12)- A young lady who moves into the same apartment building as him. They met at the mail boxes and instantly hit it off. In "The Grey Team" she's seen working with him at the beginning of the episode at a little diner called "The Puppy Platter".

The A-Team film keeps many of Murdock's traits and characteristics intact, including his amazing piloting abilities, surprising knowledge of many topics, acting ability and fluency in other languages (in this case, Swahili) and accents (such as English, Scottish, Australian and South-African).

Unlike in the TV series, he is not a member of the A-Team from the beginning; he joins the other three during a mission when they need a pilot at the last minute while fleeing a renegade general, a patient in a mental hospital, but is released into Hannibal's custody. Like his TV counterpart, the film Murdock also leaves open the possibility that he's eccentric and simply pretending to be insane. However, he does mention he "feels sane" after a blow to the head before the end of the movie. Murdock's fixation on pop culture characters is also kept intact, specifically in one scene where he re-enacts Mel Gibson's portrayal of William Wallace in the movie Braveheart.

In the early part of the film, Murdock himself is shown to be the reason B.A. is afraid to fly, as Murdock's stunt-flying the first time they flew together almost caused him to fall out of their helicopter. He implies that he has an Army Ranger tattoo like B.A., Hannibal, and Face, but his uniform in the courtmartial scene doesn't have the RANGER flash that the uniforms of the other three do, showing only SPECIAL FORCES and AIRBORNE.

In a post-credits scene, Murdock is shown receiving electro-shock therapy, while two doctors look on. One of them (Schultz) comments on Murdock's mindstate, saying, "This guy Murdock is nuts." Adding onto his odd habits is "gunpower barbecuing", where he uses smokeless gunpowder taken from shotgun shells to cook steaks; he also offers to add "secret sauce", which is anti-freeze.

In an episode of Robot Chicken, a bar owner's insurance could only cover the B-Team, and Murdock is played by a clearly insane and suicidal actor tied in a straitjacket. In the end of the episode he is shown to have hanged himself.